+ sigc::signal<void, Train &> signal_train_added;
+ sigc::signal<void, Train &> signal_train_removed;
+ sigc::signal<void, Vehicle &> signal_vehicle_added;
+ sigc::signal<void, Vehicle &> signal_vehicle_removed;
+ sigc::signal<void, Block &, Train *> signal_block_reserved;
+ sigc::signal<void, const std::string &> signal_emergency;